Improvement in calendars



J. W. ROBINSON.

Calendars.

No. 216,975. `Patented July 1, |879.

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Inl/'anfora N. PETERS, 'FNnTo-UTHDGRAFHER. WASHINGTON. D C.

UNITED STATES PATENT OFFICE.

JAMES W. ROBINSON, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN CALENDARS..

Specification forming part of Letters Patent N0. 216,975, dated July 1,1879 application filed v April 9, 1879.

To all lwhom it may concern Be it known that I, JAMEs W. RoBnvsoN, of

Boston, of the county of Suffolk and State of Massachusetts, haveinvented a new and useful Improvement in Calendars and do hereby declarethe same to be described in the following specification, and representedin the accompanying drawings, of whichyear, the first being to the leftand the second to the right. Besides such tables the calendar has asliding scale,O, of days of the week, such scale being placed Vbetweenthe two tables, and applied to one of them by clasps a a, so as te becapable of being moved lengthwise between and parallel to them. Thisscale has the names or abbreviations of the names ofthe days of sixweeks arranged on it in their order, as shown, each Sunday being denotedby a letter, S.

At the head of cach table are the names or abbreviations thereof of themonths in a year from January to December, inclusive, all being in oneline 5 and below each, at equal distances apart corresponding to thedistance apart of the names of the days on the sliding scale O, are thenumbers of the days of eachI mon th, and against each of said numbers isa smaller number of figures, indicating what day ofthe year the day ofsuch number is.

As Wednesday was the first day of January ofthe year 187 9, the iigure lindicative of such is placed on the third line from the top, the

iirst line being supposed to representMonday. The Viirst days ofFebruary, March, and November, being Saturday, come on the sixth line,the rst of April and July on the second line, the :tirst day of May onthe fourth line, the rst day of June on the seventh line,'the rst Y dayof August on the fifth line, and the iirst lays of September andDecember on the first From each of said startings of the rst day of eachmonth the other days of such month are numbered downward consecutively,as Shown. f-

The leap-year table is alsoV similarly made; but as it has three hundredand sixty six days, the first day of March becomes the sixty-rst insteadof the sixtieth day or the year, as it is in the other table.

The object of having the week-day scale to slide endwise between the twotables is not only toenable it to be properly adapted to either tablefor any year, but to enable a person to ascertain the day of the weekcorresponding to any date in this century or in others.

Attached to the first table, A,is whatlterm the Reference-Table,77 whichgives the years of this century, and against a number which in thevertical column of days in December of the first table is opposite thefirst Sunday of that year-as, for instance, the iirst of January 1800-isWednesday.

, New, the sliding scale being set so as to bring Wednesday of the iirstweek opposite January 1, we shall iind the following Sunday opposite thenumber 7 in the column for December, such number corresponding with thenumber against 1800 in the referencetable. The other reference-numbersfor the other year are obtained in a similar manner.

To find the day of the week of any date in this century, place one S ofthe sliding scale opposite the date in December column of the left tableindicated by the number opposite that year in the reference-table. Theweekday sought will be found opposite the given date.

For example, to find what day of the week was June l0, 187 3, place oneS of the sliding scale or slip opposite December 7, and it will be foundon the left table that Tuesday.

is the day-name sought. So to find the day of the vweek for August 12,1824, (a leapyear,)

place S opposite December 6 of the left-hand table, and we haveThursdayopposite August 12 in the right-han d table.

The rule for finding dates in other centuries is stated at the foot ofthe left-hand table.

The two tables I usually write or print on separate sheets ofpasteboard, or -other suitable material, and hinge or so connect them asto enable either to be folded over upon the other, the hinge connectionbeing shown at h.

What I claim as my invention is i in connection with the reference-tab1e, as The calendar, substantially 'as described, specified.consistinff of the slidinfr slip or scale C, having uponbit the names 5fthe days of a series v JAMES W ROBINSON' of Weeks, as represented, andthe two com- Witnesses: mon and leap year tables 0r tablets A B of R. H.EDDY,

months and days thereof, arranged as shown, W. W. LUNT.

